Core structure for clay extruding dies



I Feb. 6, 1940. E. H. PETTLER 2,188,984

CORE STRUCTURE FOR CLAY EXTRUDING DIES Filed Dec. 2, 1938 Rig. 1 Rig. 2

INVENTOR. Paw

ATTORNEY.

Patented Feb. 6,1940 I UNITED} STATE CORE" STRUCTURE non I DIES S TE T;O IC Eugene H. Pettler, Beaver, 'Pa.

Application December 2, 1938, Serial No. 243,553

3 Claims. (01. 25-17 I repair and subject to arrangements, singular orin multiples, without necessitating removal of the entire coresupporting member.

' These and other objects of the invention will becomemore apparent froma consideration of the accompanyingdrawing constituting a part hereof inwhich like reference characters designate like parts and in which:

Fig. 1 is a vertical cross-sectional view partially in elevation of anextruding device embodying the principles of this invention;

Fig. 2 a side elevational view partially in section of a portion of acore bridge and core member'for use as shownin Fig. 1 of the drawing;

Fig. 3 a cross-sectional viewof the core bridge showing a portion of acore rod in side elevation;

Fig. 4 a view in perspective of the extruded clay product resulting fromthe operation of the die of Fig. 1; and

Fig. 5 a front elevational view of the mouth piece of the extrudingdevice.

With reference 'to the several figures of the drawing, the structuretherein illustrated comprises a back platel, a mouthpiece .2 mounted onthe ends of a barrel 3 by means of throughbolts 4, the barrel beinghollow and provided with conduits 5 and 6 for the passage of steamthrough the barrel chamber, which acts to lubricate the clay passingtherethrough. A series of frames 1 are arranged in superposed relationas shown, the frames being unsealed to permit the passage of steamthrough the joints in contact with the clay passing therethrough, thedirection of travel of the clay being from the opening through the backplate through the frames and the opening of the mouthpiece. Thestructure thus far described is conventional and constitutes no part ofthe present invention, which deals only with the manner of mountingandsupporting a plurality of cores 8, which form the perforations orcells 9, Fig. 4, in the block [0, which is the product of the extrusiondevice of Fig. 1, cut-offafter it emerges from the mouthpiece 2.

In acccordance with the present'invention, the

cores 8 of streamline shape, as shown in the enlarged detail of Fig. 2,are looselymounted on core rods II, which are substantially of hair-'pinshape as-shown in Fig. 3, the core rods being looped over a corebridge l2 which extends across a and substantially centrally of theopening in the back plate I. The core rods are preferably threaded attheir ends to provide axial adjustment of the cores relative to themouthpiece, as shown in Fig. 1, wherein the cores are spaced a supplieddistance inward from the outer face of the mouthpiece 2. The core bridge[2 is secured to the back plate I by a clamping bracket l3 which isfastened by the through-bolt 4 when the extruding device is asssembledas shown in Fig. 1.

The core bridge I2 is provided with indents or grooves Mspaced inaccordance with the desired spacing of the cells 9 in the finishedproduct. As shown in Fig. 3 the core rods are indented at l5 to providecontacting areas with the side faces of the core bridge l2 to give themsupport with a minimum area of contact to render the core rods freelymovable relative to the core bridge, permitting self-alignment of therods with the flow stream of the clay or other plastic material. .As isfurther apparent from Fig. 3 of the drawing, the core rods ll may beadjusted by spreading or contracting them to adjust the spacing of eachpair of cores 8 in accordance with .the desired spacing of the cells theextruded product. i,

In the. operation of the hereinbefore described extruding device, thecore rods are, in effect, floating members which permit self-alignmentof the cores 8 relative to each other and the mouth piece 2. This is ofconsiderable importance in the use of a'device as it eliminates theinaccuracy resulting from the use of core pieces having their supportsrigidly secured to the core bridge as by welding or other expedientsemployed in conventional practice. It is also apparent that thereplaceable core rods effect great economy in use of such device byavoiding thenecessity for replacing a complete core bridge and coremembers where such are integrally formed structures. These and otheradvantagesof the'invention will be self-evident to those skilled in theart.

Although one embodiment of the invention has been hereinillustratedanddescribed, it will be I evident to thoseskilled in the art thatvarious. modifications may be made in the details of construction, asfor example in the shape of the cores and the number of core membersemployed or in the manner of attaching the core bridge, and in theadaptation of the self-align- ,ing core members to different types ofextruding devices, without departing from the principles herein setforth.

I claim: 7

1. A core structure for extruding dies for plastic materials comprisinga barrel having a back and extending into the flow passageof theektruding device, said core rods loosely abutting the leading edgeofthe, core-bridge and being adapted for self-alignment with thefiowstream of the material passing therearoundand'cores mounted on thefree. ends of said core rods.

2. Apparatus as set forth in the next preceding claim characterized by acore bridge having a plurality of spaced grooves in the leading edgethereof constituting seating abutment for the looped ends of the corerods.

3. Apparatus as set forth in claim 1 characterizedby the core'rods beingof substantially hairpin shape, having indentecl'portions for engagementwith opposite faces of the core bridge, whereby the cores of therods'may be adjusted relative to each other.

EUGENE PETTLER. 1'5

